For whatever reason, I ended up (re-)watching the dub. Not bad at all. I'm never going to be a "dub guy" per se, but this one is perfectly watchable as far as I'm concerned.
Haro's voice did seem a little annoying and I'm not quite sure about Sergei, Marina, Saji or Graham, in terms of casting as opposed to acting, but there's plenty of time for the VAs to grow into their roles. Everyone else seemed to be decent to good so far.
As for the series itself, I'd say it is one of the better AU series and definitely worth a try. The show takes its time to really get going, which may require patience but it's also a positive in terms of world building. When it does, things get fairly exciting, with a couple of nice twists to the usual Gundam formula even if still within the rough limits of what experienced fans of the franchise have come to expect.
There are plenty of remaining similarities to other previous shows, yes, but overall, the first season of 00 manages to be particularly well executed in its own right. Even if I'm not the biggest 00 fan around, by any means, I sincerely like it and hope dub watchers will also find it entertaining.